Concrete-mixer.



J. R. BOARDMAN.

CONCRETE MIXER.

A PPLIGATION FILED Amma, 1912. Y

Patented Nov.5, 1912.

2 SHEETS-SHEET 1.

. J. R. BOARDMAN.

CONCRETE MIXER. Arrmomlon FILED APB. as, 1912. l

Patented Nov. 5, 1912.

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UNITED STATES PATENT oEEioE.

JOHN n. iaoAncoMANfor oxLAHoMA, OKLAHOMA, AssIoNon. To' WYLIE MANUFACTUR- v ING COMPANY, OF OKLAHOMA, OKLAHOMA coNoiaii'ra-Mixiiizk Specification of Letters Patent.

Patented Nov. 5, 1912.

Application mea April 2s, i912. serial mi. 692,679.

. State of Oklahoma, have invented certain new and useful Improvements in Concrete- Mixers, of which the following is a specification.

This invention relates to concrete mixers l0 and has for its object the provision of a simple and efiicient apparatus which may be easily moved from point to point, and

b which cement, broken stone, and other e ements may be thoroughly and rapidly mixed with very little labor.

Another object of the invention is to provide` a concrete mixer in which the mixing drum will be so constructed that the materials to be mixed will be thoroughly agi- A tated and commingled without` the use of any complicated structures and discharged from the drinn without the necessity of any complicated closures or discharging spouts.

The invention seeks further to provide a drum having internal elements by which, as

tive view of the complete apparatus; Fig. 2.

is a transverse section of the mixing drum on a larger scale; Fig. 3 is a longitudinal section of the drum taken on the line 3-3 of Fig. 2; Fig. 4 is a similar view taken on the'line 4--4 of Fig. 2; Fig. 5 is a detail perspective view'of one of the shelves employed within the drum. Y y

In carrying out my present invention, I

`employ a truck comprising a pair of wheels 1 mounted upon a suitable axle supported in hangers 2 secured to the ends of side bars 3 to which, for the greater portion of their length, is secured a platform 4. At the ends of the side bars or sil'ls3, distant from the'wheels 1, I provide legs or other form bAll these stated objects, and such other o of supports 5 by'which the platform may be retained in a horizontal position while the drum is being operated to mix the concrete. A rhandle 6 is also provided at the adjacent ends of the side bars or sills 3 so that the truck may be easily moved from point to poi-nt, as may be necessary.

At that end of the truck which is supstandards 7 having a beam 8 secured upon and carried by their upper ends, and u on the said beam, at the end immediately a jacent the platform, I mount a transverse driving shaft 9 equipped with crank handles 10 at its ends and carrying a sprocket pinion 11 adjacent one end. A sprocket chain 12 passes over the said pinion and over a sprocket wheel 13 which is fixed upon a hollow shaft 14 journaled upon the beam 8 at a point remote from the platform, the said hollow shaft carrying the mixing drum 15. The mixing drum is constructed of sheet steel and consistsof ends or heads 16 which are rigidly secured to the hollow shaft 14 in any convenient manner, preferably by means of brackets or hubs 17 bolted to the heads 16 and keyed or otherwise Ifixed" to the shaft, and a side 18 which is of a cylindrical formation having a longitudinal opening, indicated at 19, extending between the heads. The cylindrical body 18 is provided with lianges at its ends through which and the heads 16, suitable securing bolts or rivets aret'finserted', and to re-inforce the structure rings 21 may be placed against the outer surfaces of the heads and secured thereto by the same rivets which secure the cylindrical body in position, as will be readily understood. v

At one edge of the opening 19, a flange 22 is provided on the body, said flange' extending inwardly and being adapted to fit against the front closing plate 23 which is secured. thereto and to a supporting bar 24 at its lower edge which extends longitudinally of the drum in substantially the radial planeof the opposite edge of the opening 19. The said closing plate 23 is disposed parallel with one radius of the drum, I as shown clearly in Fig. 2, so that the inner edge of the plate is spaced from the opposite edge of the body of the drum, thereby leaving an uninterrupted opening through which the material may be fed into and discharged from the drum. The edges of this plate 23 .ported by the carrying wheels l, `I erect iio are reinforced by and secured to angle-bars 25 which are arranged against the inner surface of the plate andfollow the outline of the same, as will be readily understood upon reference to Fig. 2. Within the drum and against the ends thereof, and also against the inner face of the closing plate or partition 23, -I provide shelves 26 which are disposed at an angle to the heads of 45, more or less, and extend from the heads to the hollow shaft, as shown most clearly in Figs. 3 and 4. These shelves are constructed of steel plates each having a triangular portion 27 bent substantially at a right angle to its main portion and extended fromthat edge most remote from the opening in the drum to forma partition whereby the material in the drum will be prevented from passing under the shelves and collecting therein, the shelves and the vpartitions having flanges 27 through which fastening devices may be inserted to secure them to the heads 16 and the covering plate 23.

` It will be observed, upon reference more particularly to Figs. 3 and 4, that the shelves converge from the heads or ends of the drum,Y

toward the hollow shaft, so that the material deposited upon the shelves will be projected toward the center of the drum and fall therefrom' toward the lowest point of the drum. Within the drum, at a pointaway from the shelves and the openin in the drum, I provide a divider or de ector 28 which is substantially a rigid plate bolted or riveted to the body of the drum and having its ridge 29 extending across the drum at an angle to the radius of the same. The parts should be so positioned within the drum that when the front closing plate 23 is vertical,` the open space between the then lower edge of said plate and the front or free edge of the cylindrical body of the l drum will be horizontal, the deflector 28 then extending from the lowest point of the drum upwardly and rearwardly, so as to constitute a segment of the circle described by the body of the drum. The shelves will then be above i the dellector and slightly in advance of the into the material placed in the drum, so that vas the said material will be separated and caused to roll toward the ends of the drum. As the rotation. of the drum continues the weight of the material will tend to keep the same at the lowest point of the drum, so that the detlector 28 will be carried entirely through the said body of material and the shelves 26 brought to the same. As the shelves are secured to the heads of the drum and converge therefrom toward the shaft, they will pass under the material so asto take up the same and cause it to roll toward' the center of the drum, the discharge of the material from the drum being prevented by the'plate 23. As theimaterial reaches the lower ends of the shelves, it will drop therefrom and consequently fall upon the detlector 28 by which it will again be turned toward the ends of the drum, and this operation is continued until the ingredients have been .thoroughly c ommingled;V It will be understood, of course, that water to the desired quantity is admitted to the drum through the hollow shaft which is provided with perforations 30 to cause the water to discharge onto the material in the drum.

vbefore the drum is rotated reversely to dis-A charge the mixture.

It will be readily seen from the foregoing description, taken in connection with the accompanying drawings, that' I have provided an exceedingly simple concrete mixer by which the materials may be thoroughly and rapidly commingled, and which is free of complicated gearing or agitators, so that it may be produced at a low cost. The apparatus.`wi1l be found especially desirable in plants for manufacturing concrete pipes or other similar articles which are formed in small molds, and a detailed reference to its many advantages is believed to be unnecessary.

' Having thus described my invention, what I claim as new, is

1. A concrete mixer comprising a rotary drum having an opening through which material is fed and discharged, a detlector at one side of the drum remote from said opening and spaced from the ends thereof and having its greatest dimension in a radial plane of the drum to 'turn the material toward the ends of the drum, andinwardly projecting devices on the ends of the drum to cause the material to roll from the ends the dru'm and converging toward the axis of the same to take up the material. andl discharge it upon the' said deflector.

3. A concrete mixer comprising a rotary drum, a transversedeiectorr therein, and

shelves consisting of plates bent at right n "=angles,

plate, and shelves onthe ends of the drum ends of the drum at anl immediately adjacent the said plate and converging toward the said deleetor.

5. A concrete mixer comprisin a rotary drum, a transverse defiector therein, shelves consisting of plates bent at right angles, the greater portions of the plates extending from the ends ofthe drum at an angle thereto toward the deflector and the lesser portions of the plates extending from the free edges of the shelves to the ends of the drum, and a plate extending longitudinally of the drum against the shelves parallel with the lesser portions of the same.

` In testimony whereof I aix my signature in presence of two Witnesses.

JOHN R. BOARDMAN.

v lVitnesses':

H. Gr.f STEWART, J. S. WYLIE.

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